Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / A presente dissertação tem o objetivo de propor a reinclusão de elementos de Cálculo no ensino médio, pois no passado o Cálculo fazia parte do currículo e foi abolido após uma reforma no ensino da matemática. O trabalho apresenta os resultados de um levantamento estatístico sobre os índices de reprovação na disciplina Cálculo Diferencial e Integral I nos períodos mais recentes da Universidade do Estado do Rio de Janeiro (UERJ) e, também, uma pesquisa quantitativa com quarenta professores de matemática com o objetivo de analisar a viabilidade do projeto e os problemas a serem enfrentados. Por fim, a dissertação conta com uma série de atividades comentadas sobre o tema de limites, que é o foco do trabalho. Tais atividades podem ser incluídas já no 1 ano do ensino médio, paralelamente ao conteúdo de funções, e visam proporcionar aos estudantes o contato com elementos de Cálculo em uma linguagem acessível, e orientar o professor nesta tarefa / This dissertation has the objective of proposing the reinclusion of Calculus elements in high school, because in the past Calculus was part of the curriculum and it was abolished after a reform in mathematics teaching. This paper presents the results of a statistical return about the rates of fails in the subject Differential and integral Calculus I in recent terms at Universidade do Estado do Rio de Janeiro (UERJ) and also a quantitative research with forty mathematics teachers, which has the objective of analyzing the viability of the project and the problems to be faced. Finally, the dissertation has a series of discussed activities about the theme of limits, which is the focus of this paper. These activities can be included in the first year of high school, at the same time as functions content. They aim to offer students a contact with Calculus elements in an accessible language and also to orientate the teacher in this task.

Conselho Nacional de Desenvolvimento Científico e Tecnológico / The appropriate estimation of turbulent fluxes in very stable conditions is a great challenge for numerical models that simulate the average behavior of the stable boundary layer. Although many features of the flow are usually reproduced, the intermittent variation turbulence is not simulated by most atmospheric models that use K theory for the determination of turbulent fluxes in the stable boundary layer. Moreover, the transition between the very stable and weakly stable regimes of the stable boundary layer is not well understood and described by numerical models. Therefore, in this work a one-and-a-half order numerical model is proposed to represent the average behavior of the nocturnal boundary layer. The model is based in the one proposed by Costa et al. (2011). In the presently proposed scheme, both the sensible heat flux and temperature variance are solved by prognostic equations in order to add degrees of freedom and physical detail to the model. Throughout the work, comparisons are made among the solutions varying different parameters. Results are also compared to the solutions obtained using the model proposed by Costa et al. (2011). The results show that the present model is able to reproduce the transition between the coupled and decoupled stable boundary layer regimes, in a manner similar to what is observed in nature. It also reproduces the occurrence of intermittent non periodical events and the formation of shallow mixing in weak wind conditions. The inclusion of prognostic equations for the sensible heat flux and for the temperature variance provides transitions between regimes at larger winds than those obtained when these quantities are parameterized, and closer to the observed values. The model provides a dependence of the potential temperature scale, θ∗ and of the sensible heat flux on the wind speed that is similar to observations. It also reproduces abrupt transitions between the stable boundary layer regimes, something not observed in the model proposed by Costa et al. (2011). The turbulent kinetic energy balance obtained by the model is closer to the observed by Acevedo et al. (2016) than was obtained by Costa et al. (2011). Dissipation is the dominat mechanism of turbulence destruction in very stable conditions, a role played by buoyant destruction in the model by Costa et al. (2011). The results sustain the hypothesis proposed by Van Weil et al. (2012), that the very stable regime happens when turbulence is not capable of sustaining turbulent heat fluxes large enough to accompany the long wave radiative loss. / A estimativa adequada dos fluxos turbulentos em condições muito estáveis ainda é um grande desafio para os modelos numéricos que descrevem o comportamento médio da CLE. Embora, muitas características do escoamento sejam simuladas, a variação intermitente da turbulência não é reproduzida por grande parte dos modelos atmosféricos que utilizam teoria K na estimativa dos fluxos turbulentos na CLE. Além disso, a transição entre os regimes muito estável e fracamente estável da CLE, ainda, não é bem compreendida e descrita pelos modelos numéricos. No presente trabalho é proposto um modelo numérico, de uma ordem e meia, para descrever o comportamento médio de uma camada limite noturna. O modelo é baseado no que foi proposto por COSTA et al. (2011). O modelo aqui proposto tanto o fluxo de energia na forma de calor sensível como a variância de temperatura são estimados através de equações prognósticas, afim de acrescentar graus de liberdade ao sistema e de modo a acrescentar detalhamento físico à solução. Ao longo do trabalho, foram realizadas comparações entre as soluções obtidas no modelo variando diferentes parâmetros. As soluções também são comparadas com as obtidas utilizando o modelo proposto por Costa et al. (2011). Os resultados mostram que o presente modelo é capaz de reproduzir as transições entre os estados acoplado e desacoplado da camada limite estável, de forma semlhante à observada na natureza. São simulados eventos intermitentes não periódicos que se assemelham aos observados na camada limite. O modelo também reproduz a ocorrência de mistura rasa em condições de vento fraco. A inclusão de equações prognósticas para o fluxo de energia na forma de calor sensível e para a variância de temperatura proporciona transições entre os estados e em condições de vento mais intensas que as obtidas quando essas quantidades são parametrizadas, e mais próximo dos valores observados. Ao observar a dependêndia das quantidades turbulentas, tais como a escala de temperatura potencial, θ∗, e o fluxo de energia na forma de calor sensível em função da velocidade do vento, o presente modelo modelo apresentou os resultados mais semelhante aos observados, se mostrando capaz de reproduzir as transições entre os estados de forma abrupta, diferente do que ocorre no modelo proposto por Costa et al. (2011). O balanço de ECT obtido pelo presente modelo, se aproxima mais do observado por Acevedo et al. (2016) que o obtido por Costa et al. (2011). A dissipação é o mecanismo dominante de destruição de turbulência no estado desacoplado, papel que era ocupado pela destruição térmica no modelo de Costa et al. (2011). Os resultados coroboram a hipótese de Van de Weil et al. (2012), de que o regime muito estável ocorre quando a turbulência não é capaz de produzir fluxos de energia na forma de calor sensível capazes de acompanhar a perda de energia por radiação.

Made available in DSpace on 2014-06-11T19:27:09Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-10-29Bitstream added on 2014-06-13T19:06:51Z : No. of bitstreams: 1 proto_vg_me_rcla.pdf: 1615770 bytes, checksum: b8ab644ba57357ab0e094e28e7f34659 (MD5) / Not available

Made available in DSpace on 2015-04-17T14:49:41Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 1572748 bytes, checksum: 77638fe3cad1c3241c694bca4dc273ac (MD5) Previous issue date: 2014-11-28 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / Older adults represent a segment of population that has more increased in recent years. In Brazil, estimates for next 20 years indicate that elderly population will exceed 30 million people, which can reach nearly 13% of population. Regular physical activity provides one of most opportunities for improving quality of life, improve physical condition and reduce disability and functional limitations of elderly people. The increasing of elderly population has raised need to understand changes that occur in this stage of life, as well as their implications, since, during aging, there are several physiological changes that can affect perception of food for older consumers. For these reasons, present study aimed to evaluate taste sensitivity in elderly people practitioners of physically active, since little is known about sensory responses provided by this group. Threshold test was used to determine detection threshold for salty and sweet flavors in 40 young adults (18-38 years), 40 elderly practitioners of regular physical activity (60-84 years) and 40 elderly no activity practitioners physical (60-87 years). Women accounted for 90% in the group of elderly practitioners of physical activity and 60% of non-elderly practitioners, feature explained by aging feminization process. Physically active elderly had 4.12 mMol thresholds for salty and 6.20 mMol for sweet taste, values close to the group of young adults surveyed and below values found in other studies that worked with sensory perception in the elderly. There were significant minimization of sensory changes of salty and sweet taste in elderly practitioners of physical activity, providing to this group sensorial perception capacity similar to young adults group. Physical activity contributes in some ways to the best development of sensorial perception of older people who practice physical activity, a positive factor for both active development of that group and to its perceptual capacity. / Indivíduos da terceira idade representam um dos segmentos da população que mais tem aumentado nos últimos anos. No Brasil, as estimativas apontam para os próximos 20 anos que a população idosa irá exceder 30 milhões de pessoas, o que pode chegar a representar quase 13% da população. A atividade física regular proporciona uma das maiores oportunidades para se melhorar a qualidade de vida, melhorar as condições físicas e reduzir a incapacidade e limitações funcionais dos idosos. O crescente aumento da população idosa vem despertando a necessidade de se compreender as mudanças que ocorrem nessa fase de vida, bem como suas implicações, uma vez que, durante o envelhecimento, ocorrem diversas transformações fisiológicas que podem afetar a percepção de alimentos por consumidores idosos. Por esses motivos, o presente estudo teve como objetivo avaliar a sensibilidade gustativa em idosos praticantes de atividade física, uma vez que pouco se sabe sobre as repostas sensoriais fornecidas por esse grupo. Foi utilizado o teste de limite para determinar os limiares de detecção para os sabores salgado e doce, em 40 adultos jovens (18-38 anos), 40 idosos praticantes de atividade física regular (60-84 anos) e 40 idosos não praticantes de atividade física (60-87 anos). As mulheres representaram 90% no grupo dos idosos praticantes de atividade física e 60% dos idosos não praticantes, característica explicada pelo processo de feminilização do envelhecimento. Os idosos praticantes de atividade física apresentaram limiares de 4,12 mMol para o gosto salgado e 6,20 mMol para o gosto doce, valores estes próximos aos do grupo dos adultos jovens pesquisados e abaixo dos valores encontrados em outros estudos que trabalharam com percepção sensorial em idosos. Houve minimizações significativas das alterações sensoriais do gosto salgado e doce em idosos praticantes de atividade física, proporcionando a este grupo capacidade de percepção sensorial semelhante à de adultos jovens. A atividade física contribui de certa forma no melhor desenvolvimento da percepção sensorial dos idosos que praticam atividade física, sendo um fator positivo tanto para o desenvolvimento ativo desse grupo como para sua capacidade perceptiva.

Une méthode de calcul de forçage optimal a été employée afin d'analyser le caractère amplificateur sélectif de bruit d'écoulements compressibles pariétaux. Une telle approche inclut la prise en compte de croissances non-modales induites par la non-normalité des équations de Navier-Stokes linéarisées. La méthode numérique repose sur le calcul de la matrice résolvante globale et la résolution d'un problème aux valeurs propres associé à un problème d'optimisation. Les densités d'énergie des forçages et réponses optimaux calculés pour une couche limite supersonique ont pu être reliés à la courbe neutre expérimentale obtenue par Laufer et Vrebalovich, à condition de contraindre la localisation du forçage en amont de la branche inférieure. Par la suite, une étude paramétrique en nombre de Mach de la réceptivité 2D d'une interaction choc/couche limite laminaire a permis de caractériser le développement d'instabilités convectives de Kelvin-Helmholtz et Tollmien-Schlichting (TS) à haute fréquence. La réceptivité basse fréquence de ce système a été mise en relation avec la résonance d'un mode global stable. Par ailleurs, une extension de la méthode numérique 2D a été proposée pour le calcul de perturbations 3D. Son application au calcul du forçage optimal d'une couche limite à M=4.5 a permis de mettre en évidence la croissance non-modale 3D de streaks ainsi que le développement d'ondes TS obliques dont la croissance, en régime compressible, est favorisée par rapport à celle des ondes 2D. Cette étude a également permis d'observer la croissance du mode de Mack à plus haute fréquence. / Parietal compressible flows have been studied by means of optimal forcing computations in order to characterize the noise amplifier nature of these flows. This approach is able to take into account the non-modal growth of linear perturbations induced by the non-normality of the linearized Navier-Stokes equations. The numerical strategy is based on the computation of the global resolvent matrix and an eigenvalue problem stemming from an optimization problem. Optimal forcing and response energy densities of a supersonic boundary layer have been linked to the experimental neutral curve obtained by Laufer et Vrebalovich, provided that the forcing localization is constrained upstream from the lower branch. Afterwards, a parametric study with respect to the Mach number of the 2D receptivity of the laminar shock wave/boundary layer interaction flow has allowed to analyze the growth of Kelvin-Helmholtz and Tollmien-Schlichting instabilities (TS) occurring at high frequencies. At low frequencies, the receptivity of the system has been linked to the resonance of a stable global mode. Furthermore, the 2D numerical method has been extended to allow the computation of 3D perturbations. This approach has been applied to a supersonic boundary layer flow at M=4.5 in which the 3D non-modal growth of streaks has been identified, as well as the development of oblique TS waves, whose growth is larger than the one associated to 2D waves in compressible regime. This study has also allowed to detect the growth of Mack mode at higher frequencies.

L'objet de la présente thèse était d'examiner les caractéristiques de complexité et de dynamique du momentum psychologique (MP) en sport. Une première série d'études a tenté d'explorer qualitativement (étude 1) et quantitativement (études 2, 3 et 4) ces caractéristiques en situations naturelles de compétitions sportives. L'étude 1 a mis en évidence la richesse des contenus du MP, la diversité de ses mécanismes de déclenchement (dissonance, consonance, perturbation du flux de pensées), ainsi que ses formes de développement au cours du temps (processus d'amplification). Ces résultats témoignent de l'enracinement du MP dans une histoire d'événements signifiante. Les études 2, 3 et 4 ont montré que certains contenus affectifs du MP, tels que l'anxiété compétitive et la confiance en soi, peuvent subir des changements abrupts au cours des phases de MP, ce qui suggère le caractère non linéaire du phénomène. Par conséquent, une seconde série d'études (études 5, 6, 7 et 8) a ensuite été réalisée afin de tester expérimentalement les propriétés potentielles de non linéarité et de dépendance à l'histoire du MP en adoptant l'approche des systèmes dynamiques. Ces études étaient basées sur des scénarios de performance de prise d'ascendant (momentum positif) ou de décrochage (momentum négatif) impliquant des situations d'acteur en position virtuelle (études 5 et 6) ou réelle (étude 7), ou encore des situations de spectateur (étude 8). Le MP est apparu évoluer sous la forme d'un patron d'hystérésis négative (études 5, 6 et 8) ou d'un patron de limite critique décalée (étude 7) dans le sens où le MP négatif se déclenchait plus rapidement que le MP positif. L'hystérésis négative observée chez les spectateurs (étude 8) présentait, quant à elle, une asymétrie évoquant un déclenchement plus rapide du MP positif. Ces résultats attestent des propriétés de non linéarité et de dépendance à l'histoire du MP, montrent l'influence du degré d'implication dans la situation sur sa dynamique et confirment l'hypothèse générale selon laquelle le MP est un phénomène complexe et dynamique. / The present thesis aimed to examine the characteristics of complexity and dynamics of psychological momentum (PM) in sport. A first series of studies attempted to explore qualitatively (Study 1) and quantitatively (Studies 2, 3, and 4) these characteristics in natural situations of sport competition. Study 1 evidenced the richness of PM contents, its mechanisms of emergence (dissonance, consonance, and thought flow disturbance), as well as its forms of development over time (amplification processes). These findings suggest that PM is rooted in a meaningful history of events. Studies 2, 3, and 4 showed that certain affective contents, such as competitive anxiety and self-confidence, can change abruptly during PM phases, which suggests the nonlinear character of PM. Consequently, a second series of studies (Studies 5, 6, 7, and 8) was then conducted in order to experimentally test the potential properties of non linearity and history-dependence of PM through the lens of the dynamical systems approach. These studies were based on ascending (positive momentum) versus descending (negative momentum) scenarios of performance that were virtually (Studies 5 and 6) or actually (Study 7) experienced by actors, or that were seen from the point of view of a spectator (Study 8). Variations of PM displayed patterns of negative hysteresis (Studies 5, 6, and 8) and critical boundary that was lagged so that negative PM was triggered faster than positive PM. The negative hysteresis that was found among spectators (Study 8) displayed an asymmetry that reflected a faster triggering for positive PM. These findings evidence the properties of non linearity and history-dependence of PM, show the influence of the degree of involvement in the situation on PM dynamics, and support the general hypothesis that PM is a complex and dynamical phenomenon.

La détection et l’identification de micro-organismes pathogènes est un réel enjeu de santé public tant au niveau alimentaire, que clinique ou d’intérêt national tel qu’illustré en biodéfense. Dans tous ces domaines, il est important d‘avoir des méthodes d’identification et de détection qui soient à la fois rapide, sensible et robuste. Cette thèse a pour objectif de contribuer au développement d’une approche rapide d’identification de micro-organismes sans a priori par spectrométrie de masse en tandem. Cette approche innovante, appelée phylopeptidomique, repose sur l’alliance de la peptidomique, i.e. analyse à large échelle des peptides provenant de la digestion enzymatique d’un échantillon biologique, et de la phylogénie des organismes cellulaires. Après extraction des protéines présentes dans l’échantillon à ausculter, des peptides sont générés et analysés par spectrométrie de masse en tandem. La déconvolution des signaux MS/MS à l’aide du logiciel « µOrg.ID » développé en propre au laboratoire permet d’identifier et quantifier les organismes présents dans l’échantillon en fonction des organismes indexés dans les bases de données. L’étude du protéome de Bacillus atrophaeus, agent simulant de l’anthrax, sous forme sporulée et végétative a permis d’illustrer une méthode d’identification de biomarqueurs protéiques permettant de déterminer le ratio entre les deux formes dans un échantillon. La limite de détection de la phylopeptidomique dans des échantillons purs et des échantillons en mélange équimolaire a été établie sur des bactéries modèles d’intérêts médical et environnemental. La limite de détection de spores de Bacillus atrophaeus en présence de 14 matrices interférentes (alimentaires, environnementales et autres) a permis de mettre en évidence les avantages et limitations de l’approche. Enfin, un mélange artificiel standardisé de 24 organismes a été développé afin d’évaluer les outils de bio-informatique en métaprotéomique. / The detection and identification of pathogenic microorganisms is a real public health issue for the food industry and the clinics or national interest as illustrated in the biodefense field. Thus, it is important to have identification and detection methods that are fast, sensitive and robust. This PhD thesis aims at contributing to the development of a rapid approach to identify microorganisms without any a priori by tandem mass spectrometry. This innovative approach, called phylopeptidomics, is based on the combination of peptidomics, i.e. large scale analysis of peptides derived from the enzymatic digestion of a biological sample, and the phylogeny of cellular organisms. After extraction of the proteins from the sample of interest, peptides are generated and analyzed by tandem mass spectrometry. The deconvolution of MS/MS signals using the "μOrg.ID" software developed in the laboratory enables the identification and quantification of organisms present in the sample according to the organisms indexed in generalist databases. The study of the proteome of Bacillus atrophaeus, a simulant agent of anthrax, in sporulated and vegetative form, has provided an illustration of a new method of identification of protein biomarkers, which allows determining the ratio between both forms. The limit of detection of phylopeptidomics in pure samples and equimolar mixtures was established with model bacteria of medical and environmental interests. The limit of detection of B. atrophaeus spores in the presence of 14 interfering matrices (food, environmental and others) has highlighted the advantages and limitations of the approach. Finally, a standardized artificial mixture of 24 organisms was developed in order to evaluate bioinformatics tools in metaproteomics.

The main work for Qiujing PAN’s PhD thesis is to develop the stability analysis for underground structures, which contains two parts, deterministic model and probabilistic analysis. During his 1st year of PhD research, he has mainly finished the deterministic model study. In the 2nd year, I developed a probabilistic model for high dimensional problems. / In the contemporary society, the utilization and exploitation of underground space has become an inevitable and necessary measure to solve the current urban congestion. One of the most important requirements for successful design and construction in tunnels and underground engineering is to maintain the stability of the surrounding soils of the engineering. But the stability analysis requires engineers to have a clear ideal of the earth pressure, the pore water pressure, the seismic effects and the soil variability. Therefore, the research aimed at employing an available theory to design tunnels and underground structures which would be a hot issue with high engineering significance. Among these approaches employed to address the above problem, limit analysis is a powerful tool to perform the stability analysis and has been widely used for real geotechnical works. This research subject will undertake further research on the application of upper bound theorem to the stability analysis of tunnels and underground engineering. Then this approach will be compared with three dimensional analysis and experimental available data. The final goal is to validate new simplified mechanisms using limit analysis to design the collapse and blow-out pressure at the tunnel face. These deterministic models will then be used in a probabilistic framework. The Collocation-based Stochastic Response Surface Methodology will be used, and generalized in order to make possible at a limited computational cost a complete parametric study on the probabilistic properties of the input variables. The uncertainty propagation through the models of stability and ground movements will be evaluated, and some methods of reliability-based design will be proposed. The spatial variability of the soil will be taken into account using the random field theory, and applied to the tunnel face collapse. This model will be developed in order to take into account this variability for much smaller computation times than numerical models, will be validated numerically and submitted to extensive random samplings. The effect of the spatial variability will be evaluated.

J’avais dix ans. C’était après la guerre et l’Iran était sous embargo. A l’école je n’avais que deux crayons pour écrire mes devoirs, un noir et un rouge. Les deux étaient ornés du symbole d’une marque, un crocodile noir. Cela était aussi un gage de qualité. Mes crayons crocodiles écrivaient bien. J’étais habituée à les voir, mes crocodiles. Puis je passais beaucoup de temps avec ma tante. Elle faisait de la couture. Je jouais avec les restes des tissus. J’étais fascinée par les couleurs et par des formes que je créais avec ces bouts de tissu. J’ai sans doute commencé mes premiers collages à ce moment-là. Plus tard quand je suis devenue peintre, les animaux et les couleurs étaient la base de mes peintures. Parmi ces animaux le crocodile surgissait sans que je sois consciente de la raison de cette apparition. Un jour en réfléchissant je me suis souvenue de mes crayons d’enfance ! Quand j’ai commencé à peindre, les limites et les contraintes en Iran ne me permettaient pas de m’exprimer librement. Alors le jeu d’enfance que j’avais repris dans le style de ma peinture, me rendait celle-ci agréable et ludique. J’avais mes couleurs et le jeu, et j’exprimais ce que je voulais ; j’avais réussi à trouver un langage d’expression ludique et fort et j’en étais ravie. Je n’étais pas la seule à prendre le jeu comme moyen de contourner les limites et la censure. Déjouer les limites par le jeu était le centre de notre travail. La réflexion sur l’irruption du jeu dans l’art visuel contemporain et en particulier en Iran est devenu le sujet central de ma réflexion et de mon interrogation sur les raisons qui nous ont conduit à nous exprimer ainsi. Je l’ai donc choisie comme le sujet de ma thèse. [...] / I was ten years old. It was after the war and Iran was embargoed. At school I only had two pencils to write my homework, one black and one red. Both were decorated with the symbol of a brand, a black crocodile. It was also a guarantee of quality. My crocodile pencils wrote well. I was used to seeing them, my crocodiles. Then I spent a lot of time with my aunt. She was sewing. I played with the remains of the fabrics. I was fascinated by the colors and shapes that I created with these pieces of fabric. I probably started my first collages at that time. Later when I became a painter, animals and colors were the basis of my paintings. Among these animals the crocodile arose without my being aware of the reason for this apparition. One day while thinking I remembered my childhood pencils! When I started painting, the limits and constraints in Iran did not allow me to express myself freely. Then the childhood game that I had taken in the style of my painter, made me this one pleasant and playful. I had my colors and the game, and I expressed what I wanted; I had managed to find a language of playful and strong expression and I was delighted. I was not the only one to take the game as a way to get around the limits and the censure. Breaking the boundaries through play was the center of our work. The reflection on the irruption of the game in the contemporary visual art and in particular in Iran became the central subject of my reflection and my interrogation on the reasons which led us to express ourselves thus. I chose it as the subject of my thesis. [...]

[pt] A questão da poluição ambiental está recebendo cada vez mais importância. Por esse motivo, os estudos relacionados a processos de dispersão de poluentes estão ganhando cada vez mais destaques. Como estudos em campo são mais custosos, os estudos realizados em laboratório, com modelos reduzidos, estão sendo mais aplicáveis, uma vez que permitem análises de problemas específicos. Este trabalho tem como objetivo realizar um estudo exploratório em um túnel de vento do comportamento de uma pluma emitida por uma chaminé, que permita modificações nas condições de velocidade e temperatura da pluma. Para isso, foi realizada a reprodução da camada limite atmosférica, através do Método de Irwin, simulando um ambiente suburbano, em que o perfil de velocidades média foi medido com a técnica de Anemometria de Fio Quente. Foram realizados ensaios para três condições do escoamento principal e levantados os perfis de velocidade e intensidade turbulenta à jusante da chaminé. Foi realizado um estudo da inclinação da pluma, tanto pela influência da velocidade, quanto pela diferença de temperatura da pluma em relação à do escoamento principal, que foi variada em 10 e 20 graus Celsius. As análises de concentração foram possíveis através das imagens obtidas com a técnica de Velocimetria por Imagem de Partículas. Foram feitas análises do perfil de concentração a diferentes posições a sotavento da chaminé e o coeficiente de dispersão vertical obtido foi comparado com diversas literaturas conhecidas. / [en] Environmental pollution issue is becoming increasingly important. For this reason, studies related to processes of atmospheric dispersion of pollutants are gaining prominence. Since studies in situ are expensive, laboratory studies with reduced models are useful, since specific problem can be investigated. The present work performs an experimental study, in a wind tunnel, evaluating the behavior of a plume generated by a chimney. For this, the reproduction of the atmospheric boundary layer was made, using the Irwin method, simulating a suburban environment, in which the mean velocity profile was measured with the Hot Wire Anemometry technique. Tests were performed for three main flow conditions and the profiles of velocity and turbulent intensity were made upstream of the stack. A study of the bent of the plume was made, both by the influence of the velocity, and by the temperature difference between the plume and the main flow, that was varied at 10 and 20 degrees Celsius. The concentration analyzes were possible through the images obtained with the Particle Image Velocimetry technique. Concentration profile analyzes were performed at different leeward positions of the chimney and the vertical dispersion coefficient obtained was compared with several known literatures.